Prediction of the soil-water characteristic curve based on the specific surface area of fine-grained soils
Prediction of the soil-water characteristic curve based on the specific surface area of fine-grained soils
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DOI：
10.1007/s10064-014-0664-y
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发表时间：
2015-08
影响因子：
4.2
通讯作者：
B. Dolinar
中科院分区：
文献类型：
--
作者：
B. Dolinar
本文提出了一个新的数学表达式来描述土壤-水特征曲线（SWCC）在一定范围内的含水量，其中细粒土壤表现出塑性特性。土壤吸力与含水量之间的关系可以用土壤的比表面积来表示，这一发现是基于实验确定的含水量与土壤的比表面积之间的关系，以及粘土矿物外表面吸附水层的厚度与液体和塑料极限之间的含水量之间的自由孔水量之间的关系。考虑了孔隙空间几何结构的双重孔隙模型，以及粘土团聚体中的水分全部被吸附，且吸附机制以范德华力为主。通过测量3个样品的SWCC，以及比表面积、矿物化学成分、粒度分布和Atterberg极限，验证了所提出的SWCC估算方程的有效性和适用性。尽管在SWCC的计算部分与测量部分之间发现了良好的相关性，但由于Hamaker常数的值尚未对不同矿物进行很好的定义，因此所提出的方程的实际适用性仍然存在问题。
This paper presents a new, mathematical expression for describing the soil-water characteristic curve (SWCC) over a range of water contents where fine-grained soils exhibit plastic properties. The finding that the relationship between the soil suction and the water content can be expressed in terms of the specific surface area of soils was based on experimentally determined relationships between the water content and the soil’s specific surface area, as well as between the thickness of the adsorbed water layer on the external surfaces of clay minerals and the quantity of free-pore water for the water content between the liquid and plastic limits. The double-porosity model for the pore-space geometry was considered, as well as that all the water in the clay-aggregates is adsorbed, and that the adsorption mechanism is dominated by the van der Waals forces. The validity and applicability of the proposed equation for the SWCC estimation was verified on three samples in which the SWCC was measured, as well as the specific surface area, the mineralogical and chemical compositions, the grain size distribution, and the Atterberg limits. Despite the fact that good correlations were found between the calculated parts of the SWCC and the measured, the practical applicability of the proposed equation remains problematic due to the values of Hamaker constant, which are not yet well defined for different minerals.